var barcode = require('./barcode'); function convert_length(length) { 
  return Math.round(wx.getSystemInfoSync().windowWidth * length / 750); 
} 
function barc(id, code, width, height) { 
  barcode.code128(wx.createCanvasContext(id), code, convert_length(width), convert_length(height)) 
} 
module.exports = { barcode: barc }
